18033845 has 4 divisors (see below), whose sum is σ = 21640620. Its totient is φ = 14427072.

The previous prime is 18033839. The next prime is 18033913. The reversal of 18033845 is 54833081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54833081 = 23 ⋅2384047.

It can be written as a sum of positive squares in 2 ways, for example, as 6791236 + 11242609 = 2606^2 + 3353^2 .

It is a cyclic number.

It is not a de Polignac number, because 18033845 - 2⁶ = 18033781 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1803380 + ... + 1803389.

It is an arithmetic number, because the mean of its divisors is an integer number (5410155).

Almost surely, 2^18033845 is an apocalyptic number.

It is an amenable number.

18033845 is a deficient number, since it is larger than the sum of its proper divisors (3606775).

18033845 is an equidigital number, since it uses as much as digits as its factorization.

18033845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3606774.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 18033845 is about 4246.6274854289. The cubic root of 18033845 is about 262.2382939719.

The spelling of 18033845 in words is "eighteen million, thirty-three thousand, eight hundred forty-five".